Fluid-motor.



Patented 00t .21,1913,

2 SHEETS-SHEET l.

W. E. & M. MARSHALL.

FLUID MOTOR.

APPLICATION FILED APR. 30, 1913.

'3 7% W Inventors W. B. & M. MARSHALL. FLUID MOTOR.

APPLICATION FILED APR. so, 1913.

1,076,299. Patented 0ct.21, 1 913.

I 2 BHEETS-BHEET 2.

UNITED snares PATENT OFFICE.

WILLIAM E. MARSHALL AND MARTIN MARSHALL, OF MASPETH, NEW YORK.

FLUID-MOTOR.

Application filed A ril 30, 1913. Serial No. 764,662.

Specification of Letters Patent.

Patented Oct. 21,1913.

i To allwhomit may concemi;

Be it known that we, WILLIAM E. MARI Improvements in Fluid-Motors, ofwhich the following is a specification.

This invention relates to an expansible fluid motor, and its noveltyconsists in the construction and adaptation of the parts, as will bemore fully hereinafter pointed out. It comprises briefly two series ofinter meshing vanes each series adapted to revolve m opposite directionson a central shaft through which the actuating fluid is supplied. Thereare 'ports between each pair of vanes adapted to register with thesupply ports of the central hollow shafts and intermediate cylindricaladjusters between such supply ports and the vane ports, an outside shellor casing within which the series of vanes revolve and variousadjunctsand connections, as will be more fully hereinafter described.

In the drawings, Figure 1 is a front elevation in miniature of a deviceembodying the invention; Fig. 2is a side view of one of the centralhollow shafts; Fig.3 is a section on theplane of the line 33 in 6 and aside elevation of the adjuster bridge; Fig.4 is a transverse section onthe plane of the line 4-4 in Fig. 2; Fig. 5 is a central longitudinalvertical section showing the parts in position when steam is beingadmitted through the left series of vanes; Fig. 6 is a top plan view andpartial horizontal section on the plane of the line 66 in Fig. 8; Fig. 7is a view similar to Fig. a showing the parts in position when steam hasbeen admitted to the left series of vanes and the vanes have beenrotated farther than is shown in Fig. 5; Fig 8 is a view In thedrawings, 10.is,a casing or shell ada ted to contain the v'anes, adusters and shafts. It is provided with outlet ports 100' and with twosteam pipes 20 and 30 communicating with a source of steam (not shown)and which pipes lead into two centrally arranged hollow shafts 21 and 31secured transversely across the casing 10 and capable of alimitedcircular movement. The shaft 21 is provided with a port 22 andthe shaft 31 with a port 32, and outside of the casing 10 the shaftshave made integral therewith or rigidly secured thereto, spur gears 23and 33 respectively, which both mesh with an intermediate rack 13suitably supported outside of the casing 10 and which is moved by.suitable means as a handle 14, wher'eby'both of the gears 23 and 33 maybe circularly adjusted and with them the shafts 21 and 31, but in0pposite directions.

Closely fitting over the shaft 21 is a segmental cylindrical adjuster 24which is circularly adjustable with respect to a bridge 25, which isfixed in position between the segmental edges of the adjuster and issecured to, or made integral with, the pipe 20. Similarly over the shaft31 is a segmental cylindrical adjuster 34 movable with respect to a.bridge 35. Eachadjuster 24 and 34 is provided with a spur gear 26' and36 made integral therewith, or rigidly secured thereto, and each ofwhich meshes with an inter mediate rack 16 provided with an actuatinghandle 17. The adjuster 24 has two ports, an upper port 27 and a lowerone 28, and similarly the adjuster 34 has two ports 37 and 38. It willbe understood that by circularly moving the adjusters 24 and 34 withrespect to the bridges 25 and '35 the size of the ports bet-ween the adjuster and the bridge may be varied on each side of the bridge. Theseveral gears 23 and 33, and 36 and 26 are each slotted as indicated inFig. '4 to permit of the passage through them of the bridges 25 or '35and to give a slight clearance beyond such bridge and permit of thecircularadjustment of the two devices.

Arranged externally to each adjuster 24 and 34 and adapted to revolvethereon as upon a shaft, are the motor shells 200 and 300 respectively,each comprising a cylindrical body 201 and 301 with radially exand eachmade up of four curved surfaces,

namely, two outwardly bending curves (1 and b and two inwardly bendingcurves 0 and d so that each vane has in cross section the general shapeof the tooth of a gear. These two shells made up of series of vanes areadapted to revolve and their paths are such and they are so arrangedthat the path of the extremity of each vane (which extremity is formedby the intersection of the curves a and b) as it moves around its centeris in contact with the curves 0 and d of the vanes of the opposingshell, and at other parts of its. path such extremity is in contact withthe inner surface of the outside casing 10 during a portion of itsrevolution.

Secured to, or made integral with, each of the bodies 201 and 301 aretwo external gears 303 and 203, and 204 and304 arranged in pairs onopposite sides of the casing and adapted to mesh with each other. Theseform a synchronizing device to cause the intermeshing vanes to movetogether uniformly and steadily. The gears are connected to any suitablekind of power-transmit ting mechanism, either by shafts on which theyare secured or gearing with which they mesh or otherwise to transmit theenergy of the motor to any machine or place where it is to be utilized.

The operation of the device is as follows; Assuming that the parts arein the positions shown in Fig. 5, steam is being admitted from the pipe30 through the port in the hollow central shaft 31 and the upper port 37in the adjuster 34: and the port between two of the vanes of the leftseries into the pocket formed between the two intermeshing vanes at thatplace. The steam will expand and will cause a movement of the two seriesin opposite directions, as indicated by the arrows. The movement is inthis direction because by moving in this direction the size of thepocket into which the steam is introduced 15 increased rather thandiminished. In Figs. .7, 8 and 9 are shown successive positions of theseveral vanes as the steam continues to be admitted and cut off by thepositions of the circular adjusters and the inner central hollow shafts.As the vanes continue to revolve the ports between two successive vanesare caused to pass by the corresponding ports in the adjuster and arecut off from the central shaft depending upon the position of theadjuster with respect to the bridge. It will be understood that thisoperatioirwould take place if the adjuster were omitted, its particularfunction being for the purpose of preventing the motor from stalling ona dead center, such prevention being accomplished by an adjustment ofthe' device with respect to its bridge. As the vanes continue to revolvethe steam from the left is cut oif and that from the right is admitted,so that the operation of the device is such that steam is admittedalternately from the left and right central hollow shafts, and acontinued propulsion of both series of vanes takes place. After thevanes of the two opposing series have so moved that the pocket to whichsteam has been admitted is opened and the steam is allowed to pass fromsuch pocket to the space between the vanes and the outer casing 10 (asshown for example, in Fig. 8) a second expansion of the steam takesplace within this larger space and there is a further propulsion of thevanes. The reverse of the motor is accomplished by moving the centralhollow shafts so that their supply ports coincide with the lower portsof the adjusters and steam is admitted through such ports to the pocketsbelow the horizon-- tal center of the device. After the motor hasstarted in this direction its operation is obviously the same as before.After the ro' tation of the vanes has brought a body of the steam beyondthe pocket formed between the revolving vanes and the innercasing, the

steam can find an exit through the outlet ports as indicated and can befurther used in another motor, or discharged into the at mosphere, orotherwise disposed or asmay be deemed expedient.

There will necessarily be some vibration or impulse in a device of thiskind where the actuating fluid. is alternately supplied from differentsides of'intermesh'ihg parts.

.In order to prevent this the intermeshing gears 203 and 303 and 204 and304 are provided, and by means of their contact and engagement a regularuniform movement is insured and excessive vibration is prevented.

The adjustment of the central hollow shafts 21 and 31 is effected bymeans of the rack 13 and its handle 14, and the adjustment of the twoadjusters 34 and 24 is effected by means of the rack 16- and its handle17.

What I claim is:

l. A motor, comprising two revolving shells having series ofintermeshing vanes that revolve in opposite directions, each vane of oneset operating in the space be-. tween the adjacent vanes of the otherset, completely bridging the outer portion of such space and formingwithin the three a closed pressure chamber, and means for introducingfluid under pressure through the shells successively to the chamberswhile so closed.

2. A motor comprising two revolving shells having tubular axles providedwith series of inter-meshing vanes that revolve in opposite directions,each vane of one set operating in the space between the adjacent vanesof the other set, and means for introducing fluid under pressure throughthe tubular axles into the spaces.

3. A motor comprising two revolving acrea e shells having tubular axlesprovided with series of intermeshing vanes that revolve in oppositedirections, each vane of one set operating in the space between adjacentvanes of the other set, means for introducing fluid under pressurethrough the tubular axles into the spaces, and'means within the axlesfor controlling the-motive fluid.

4. A motor comprising two revolving shells having tubular axles providedwith series of intermeshing vanes that revolve in opposite directions,each vane of one set operating in the space between adjacent vanes ofthe other set, means for introducing fluid under pressure through thetubular axles into the spaces, and means within the axles for reversingthe supply of motive fluid to reverse the direction of rotation of theshells.

5. In a device of the character described, the combination with acylindrical shell of radially extending vanes, each having the generalshape of a gear tooth in cross section, the vanes beingsymmetricallydisposed around a common center, and means for admittingsteam between the vanes consisting of a port or ports in the shellbetween the bases of each pair of vanes,

6. A motor comprising two series of intel-meshing vanes adapted torevolve in op- POSIlTE directions, and means for supplying steam tothe-spaces, between the contacting vanes while they are in contactconsisting of steam conduits located centrally with respect to eachseries and ports leading therefrom to the space between the vanes inboth series. 7

7. A motor comprising two seriesof intermeshing vanes adapted to revolvein opposite directions, and means for supplying steam to the spacesbetween the contacting vanes while they are in contact consisting ofsteam conduits located centrally with respect to each series and portsleading therefrom to the space between the vanes in both series, andmeans for cutting off the steam from such ports.

8. A motor comprising two series of intermeshing vanes adapted torevolve in opposite directions, and means for supplying steam to thespaces between the contacting vanes while they are in contact consistingof steam conduits located centrally with respect to each series andports leading therefrom to the space between the vanes in both series,and means for cutting off the steam from such ports consisting of anapertured shell arranged intermediate the steam conduit and vanes ofeach series.

9. A steam motor comprising a central hollow shaft communicating with asource of steam supply and provided with one or more ports for the exitof the steam, a cylindrical shell adapted to revolve on said shaft andprovided with radial vanes in the general form of gear teeth and havinga port between each pair of vanes, whereby as the shell revolves steamis admitted to the spaces between each pair of vanes as the portsupplying such space coincides with a port in the hollow shaft.

10. A steam motor comprising a central hollow shaft communicating with asource of steam supply and provided with one or more ports for the exitof the steam, a cylindrical shell adapted to revolve on said shaft andprovided with radial vanes in the general form of gear teeth andhaving'a port between each pair of vanes, whereby as the shell revolvessteam is admitted to the spaces between'each pair of vanes as the portsupplying such space coincides with a port in the hollow shaft, incombination with means for varying the efficient exit area of the hollowshaft port.

11. A steam motor comprising a central 'drical shell adapted torevolveon said shaft and provided with radial vanes in the general form of gearteeth and having a port between each pair of vanes, whereby as the shellrevolves steam is admitted to the spaces between each pair of vanes asthe port supplying such space coincides with a port in the hollow shaft,in combination with means for varying the ellicient exit area of thehollow shaft port consisting of an adjuster intermediate the shaft andthe shell and which is adapted partially to close theshaft port. i

12. A steam motor comprising a central hollow shaft communicating with asource of steam supply and provided with one or more ports for the exitof the steam, a cylinlowshaft port consisting of an adjusterintermediate the shaft and the shell provided with ports adapted toregister with the shaft port and which may be moved to partially closethe same. I

13. A steam motor comprising a central hollow shaft communicating with asource of steam supply and provided with one or more ports for the exitof the steam and which shaft is capable of a limited circularadjustment, a cylindrical. shell adapted to revolve on said shaft andprovided with radial vanes in the general form of gear teeth and havinga port between each pair of vanes, whereby as the shell revolves steamnoraaee hollow shaft communicating with a source of steam supply andprovided with one or more ports for the exit of the steam and whichshaft is capable of a limited circular adjustment, a cylindrical shelladapted to,

revolve on said shaft and provided with radial vanes in the general formof gear teeth and having a port between each pair of vanes, whereby asthe shellrevolves steam is admitted to the spaces between each pair ofvanes as the port supplying such space coincides with a port in thehollow shaft, in combination with means for varying the efii cient exitarea of the hollow shaft port.

15. A steam motor comprising a central hollow shaft communicating with asource of steam supply and provided with one or more ports for the exitof the steam and which shaft is capable of a limited circularadjustment, a cylindrical shell adapted to revolve on said shaft andprovided with radial vanes in the general form of gear teeth and havinga port between each pair of vanes, whereby as the shell revolves steamis admitted to the spaces between each pair of vanes as the portsupplying such space coincides with a port in the hollow shaft, in

combination with means for varying the effi cient exit area of thehollow shaft port consisting ofan adjuster intermediate the shaft andthe shell and which is adapted partially 'to close the shaft port.

16. A steam motor comprising a central hollow shaft communicating with asource of steam supply and provided with one or more ports for the exitof the steam and which shaft is capable of a limited circularadjustment, a cylindrical shell adapted to revolve on said shaft andprovided with radial vanes in the general form of gear teeth and havinga port between each pair of vanes, whereby as the shell revolves steamis admitted to the spaces between each pair of vanes as the portsupplying such space coincides with a port in the hollow shaft, incombination with means for varying the efficient exit area of the hollowshaft port consisling of an adjuster intermediate the shaft and theshell provided with ports adapted to register with tlie'sl'iaft port andwhich may be moved to partially close the same.

17. A motor comprising two series of in tcrmrsbing *anes adapted torevolve in opposite directions, and means for supplying steam to thespaces between the contacting vanes while they are in contact, acasingadapted to iuelose both series of vanes and arranged to contact with theedges of the anes for a portion of their travel after 2M;- -ease tointer-mesh and being spaced from {ill} edges of the vanes at the pointthey cease to intermesh to permit the steam to escape into thecasing andoperate against the oppositely moving preceding vanes.

18. A steam motor comprising two series of oppositely revolvingintermeshing vanes that successively form separate enlarging pressurechambers between them, means for supplying steam to the said pressurechambers between the contacting vanes while they are intermeshed, andwhich steam escapes into the'space between the series of vanes as theintermeshing of one vane of each series with a pair of the oppositeseries ceases, in combination with means for further utilizing theexpansion power of such steam comprising casing walls that are out ofcontact with the tips of the vanes at the point said vanes, cease tomesh, and are in contact at other points.

19. A steam motor comprising two series of oppositely revolvingintermeshing vanes, means for supplying steam to the spaces between thecontacting vanes while they, are

intermeshed, and which steam escapes into the. space between the seriesof vanes as the intermeshing of one vane of each series with a pair ofthe opposite series ceases, in combination with means for furtherutilizing the expansion power of such steam which consists insurrounding each series of vanes with a jacket, the inner surface ofwhich is out of contact with the teeth at the point where they cease tointermesh and in contact with the extremities of the vanes during anappreciable portion of their revolution after they are out ofintermeshing relation.

20. A motor comprising two series of intermeshing vanes adapted torevolve in opposite directions, and means for supplying steam to thespaces between the contacting vanes while they are in contact includinga central hollow shaft for each series, and which shafts have a limitedcircular movement,

21. A motor comprising two series of intermeshing vanes adapted torevolve in opposite directions, and means for supplying steam to thespaces between the contacting vanes while they areiin contact includinga central hollow shaft for each series, and

which shafts have a limited circular movement, in combination with meansfor moving the shafts in opposite directions.

22. A motor comprising two series of intermeshing vanes adapted torevolve in opposite directions, and means for supplying steam to thespaces between the contacting vanes while they are in contact includinga central hollow shaft for each series, and which shafts have a limitedcircular movement, incombination with means for moving the shafts inopposite directions and sinniltaneously.

23. A motor comprisingtwo series of intermeshing vanes adapted torevolve in opposlte directions, and means for supplying steam to thespaces between the contacting vanes while they are in contact, includinga central hollow shaft for each series, and which shafts have a limitedcircular movement, in combination'with means for moving the shafts inopposite directions and simultaneously, comprising a gear se cured to,or made integral with, each shaft and a common toothed member adaptedto' move both gears.

24. A motor comprising two series of iIl-' termeshing vanes adapted torevolve in opposite directions, and means for supplying steam to thespaces between the contacting vanes while they are in contact, includinga central hollow shaft for 'each series, and

' which shafts have a limited circular movement, in combination withmeans for moving the shafts in opposite directions and simultaneously,comprising a gear secured to, or made integral with, each shaft and acommon rack by which both shafts may be moved. r v

25. A motor comprising two series of intermeshing vanes adapted torevolve in opposite directions, and means for supplying steam to thespaces between the contacting vanes while they are in contact, includinga central hollow shaft-for each series, and which shafts have a limitedcircular movement, in combination with means for moving the shafts inopposite directions and simultaneously, comprising a gear secured to, ormade integral with, each shaft and a common rack by which both shaftsmay be moved and which rack is provided with an actuating handle.

26. A motor comprising two series of intermeshing vanes, steam supplyingports, one between each ipair of vanes, means for varying'the out o ofall the ports including an adjusting member having a limited circularmovement, one foreaoh series of vanes.

27. A motor comprising two series of intermeshing vanes, steam supplyingports, one between each pair of wines, means for varying the out off ofall the ports including an adjusting member having a limited circularmovement, one for each series of vanes I in combination with means formoving the in combination with means for moving adjusters in oppositedirections.

28. A motor comprising two series of" intermeshing vanes, steamsupplying ports,

one between each pair of vanes, means'for varying the cut oil? of allthe ports including an adjusting member having a limited-circularmovement, one for each series of vanes the adjusters in oppositedirections and simultaneously.

29. A moto r comprising two series of intermeshlng vanes, steamsupplyingports,

common toothed member adapted to move bot-h gears.

30. A motor comprising two series of intermeshing vanes, steam supplyingports, one-between each pair of vanes, means for :varying the cut off ofall the ports including an adjusting member having a limited cir-' cularmovement, one for each series of vanes in combination with means formoving the adjusters in opposite direct-ions and simultaneouslycomprising a gear secured to, or made integral with, each adjuster and acommon rack by which both adjusters may be moved.

31. A motor comprising two series of intermeshing vanes, steamsupplyingport's, one between each pair of vanes, means for varying thecut oil of all the ports including an adjusting member having a limitedcircular movement, one for each series of vanes in combination withmeans for moving the adjusters in opposite directions and simultaneouslycomprising a gear secured to, or made integral with, each adjuster andacommonrackby which both adjusters may be moved, and which rack isprovided with an actuating handle.

32. A motor comprising two series of intermeshing vanes adapted torevolve in op one between each pair of vanes, two central hollow shafts,one foreach series of vanes,

each of which shafts has a limited circular movement, two adjustingdevices, one for each series, intermediate the vaneports and the steamsupplying ports, and each of which adjusting devices have a limitedcircular movement with respect to a centrally arranged bridge whereby ifthe central hollow shaft is moved so that its port coincides with oneside of the bridge the motor moves forward, and if itis moved tocoincide with the op osite side of the bridge the motor moves Backward.

33. A motor comprising two series of intermeshing vanes adapted torevolve in opposite directions, steam supplying-ports, one between eachpair of vanes, two central hollow shaft-s, one for each series of vanes,each of which -shafts has a limited circular move ment, two adjustingdevices, one for each series, intermediate the vane ports and the steamsupplying ports, and each of which adjusting devices has a limitedcircular movement with respect to a centrally arrgngted bridge wherebyif the central hollow s a is moved so that its port coincides with oneside of the bridge the motor moves for ward, and if it is moved tocoincide with the opposite side of the bridge the motor moves backward,and means for moving the hollow shafts simultaneously.

movement with respect to a centrally arranged bridge whereby if thecentral hollow shaft is moved so that its port coincides with one sideof the bridge the motor moves forward, and if it is moved to coincidewith the opposite side of the bridge the motor moves backward, and meansfor moving the hollow shafts simultaneously comprising a gear securedto, or made integral with, each shaft and a common toothed memberadapted to move both gears.

35. A motorcomprising two series of intermeshing vanes adapted. torevolve in op- .posite directions, steam supplying ports, one

i not between each pair of vanes, two central hollow shafts, one foreach series of vanes, each of which shafts has a limited circular movement, two adjusting devices, one for. each series, intermediate the vaneports and the steam supplying ports, and each of which adjusting deviceshas a limited circular movement with respect to a centrally arrangedbridge whereby if the central hollow shaft is moved so that its portcoincides with one side of the bridge the motor moves forward, and if itis moved to coincide with the opposite side of the bridge the motormoves backward, and means for moving the hollow shafts simultaneouslycomprising a gear secured to, or made integral with, each shaft and acommon rack by which both shafts may be moved.

86. A motor comprising two series of intermeshing vanes adapted torevolve in opposite directions, steam supplying ports, one between eachpair of vanes, two central hollow shafts, one for each series of vanes,each of which shafts has a. limited circular movement, two adjustingdevices, one for each series, intermediate the vane ports and the steamsupplying ports, and each of which adjusting devices has a limitedcircular movement with respect to a centrally arranged bridge whereby ifthe central hollow shaft is moved so that its port coincides with oneside of the bridge the motor moves forward, and if it is moved tocoincide with the opposite side of the bridge the motor moves backward,and means for moving the hollow shafts simultaneously comprising a gearsecured to, or made integral with,each

shaft and a common rack by which both low shafts, one for each. seriesofvanes, each of which. shafts has a limited circular movement, twoadjusting devices, one for each series, intermediate the vane ports andthe steam supplying ports,'and each of which adjusting devices has alimited circular movement with respect to a centrally arranged bridgewhereby if the central hollow shaft is moved so that its port coincideswith one side of the bridge the motor moves forward, and if it is movedto coincide with the opposite side of the bridge the motor movesbackward, and means for moving the hollow shafts simultaneously; andseparate means for moving the adjusting devices simultaneously.

88. A motor comprising two series of intermeshingvanes adapted torevolve in opposite directions, steam. supplying ports, one between eachpair of vanes, two central hollow shafts, one for each series of vanes,each of which shafts has a limited circular. movement, two adjustingdevices, one for each series, intermediate the vane ports and the steamsupplying ports, and each of which adjusting devices has a limitedcircular movement with respect to a centrally arranged bridge whereby ifthe central. hollow shaft is moved so that its port coincides with 1 oneside of the bridge the motor moves forward, and if it is moved tocoincide with the.

opposite side of the bridge the motor moves backward, and means formoving the hollow shafts simultaneously and separate means for movingthe adjusting devices simultaneously comprising a gear secured to, ormade integral with, each adjusterand a common toothed. member adapted tomove both gears.

39. A motor comprising two series of intermeshing vanes adapted torevolve in opposite directions, steam supplying ports, one between eachpair of vanes, two central hollow shafts, one for eachseries of vanes,each of which shafts has a limited circular movement, two adjustingdevices, one for each series, intermediate the vane ports and the.

steam supplying 'ports, and each of which adjusting devices has alimited circular movement with respect to a centrally arranged bridgewhereby if the central hollow shaft is moved so that its port coincideswith one side of the bridge the motor moves forward, and if it is movedto coincide with the opposite side of the bridge the motor movesbackward, and means for moving the hollow shafts simultaneously andseparate means for moving the adjusting devices si multaneouslycomprising a gear secured to, or made integral with, each adjuster and acommon rack by which both adjusters may be moved; a

40. A motor comprising two series of intermeshing vanes adapted torevolve in opposite directions, steam supplying ports, one between eachpair of vanes, two central hol low shafts, one for each series of vanes,each of which shafts has a limited circular movement, two adjustingdevice's, one for each series, intermediate the vane ports and the steamsupplying ports, and each of which adjusting devices has a limitedcircular movementwith respect to a cent-i ally arranged bridge wherebyit the central hollow shaft is moved so that its port coincides with oneside of the bridge the motor moves forward, and if it is moved tocoincide with the opposite side of the bridge the motor moves backward,and means for moving the hollow shafts simultaneously and separate meansfor movin the adjusting devices simultaneously comprising a gear securedto, or made integral with, each adjusted and a common rack by which bothadjusters may be boxed, and which rack is provided with an actuatinghandle.

41, A motor comprising two series of intermeshing vanes adapted torevolve in opposite directions, steam supplying ports, one between eachpair of vanes, two central hollow shafts, one for-each series ofvanes,each of which shafts has a limited circular movement, two adjustingdevices, one for each series, intermediate the vane ports and the steamsupplying ports, and each of which adjusting devices has a limitedcircular movement with. respect to a centrally arranged bridge wherebyit the central hollow termeshing vaiies adapted to revolve in oppositedirections, steam supplying ports, one between each pair of vanes, twocentral hollow shafts, one for each series of vanes, each of whichshafts has a limited circular movement, two adjusting devices, one foreach series, intermediate the vane ports and the steam supplying ports,and each of which adjusting devices we a limited circular movement withrespect to a centrally arranged bridge whereby if the central hollowshaft is moved so that its port coincides with one side of the bridgethe motor moves forward, and if it is moved to coincide with theopposite side of the bridge the motor moves backward, and means formoving the hollow shafts simultaneously, and separate means for movingthe adjusting devices simultaneonsly and means for synchronizing themovements of the two series of vanes consisting of two intermeshinggears, one adapted to be rotated from each'series of vanes. i

In testimony whereot we afix our signa tures in presence of twowitnesses. 4

WILLIAM MARSHALL. MARTIN MARSHALL, Witnesses:

MARY H. LEWIS, Cnannnon G. CAMPBELL.

